I beleive they mean you can’t expect there to be content and also expect it to be fresh and new.

I think “have your cake and eat it too” is a little ill fitting but its the general gist of wanting something and then wanting it in another way which is not compatible with the first way.

I had the same idea after i spent a bunch of time subbing a tons of communities on one account and then realizing actually i want to just look at regional news and politics sometimes and keep all the aww and meme type stuff separate.